2021-08-16 13:36:30 +02:00
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use std::fs::File;
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use std::iter::FromIterator;
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use std::{io, str};
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use roaring::RoaringBitmap;
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use super::helpers::{
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create_sorter, keep_first_prefix_value_merge_roaring_bitmaps, sorter_into_reader,
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try_split_array_at, GrenadParameters,
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};
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use crate::heed_codec::facet::{encode_prefix_string, FacetStringLevelZeroCodec};
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use crate::{FieldId, Result};
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/// Extracts the facet string and the documents ids where this facet string appear.
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///
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/// Returns a grenad reader with the list of extracted facet strings and
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/// documents ids from the given chunk of docid facet string positions.
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2021-08-24 13:55:53 +02:00
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#[logging_timer::time]
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2022-02-16 15:28:48 +01:00
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pub fn extract_facet_string_docids<R: io::Read + io::Seek>(
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docid_fid_facet_string: grenad::Reader<R>,
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2021-08-16 13:36:30 +02:00
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indexer: GrenadParameters,
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) -> Result<grenad::Reader<File>> {
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let max_memory = indexer.max_memory_by_thread();
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let mut facet_string_docids_sorter = create_sorter(
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2022-09-13 10:40:37 +02:00
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grenad::SortAlgorithm::Stable,
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2021-08-16 13:36:30 +02:00
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keep_first_prefix_value_merge_roaring_bitmaps,
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indexer.chunk_compression_type,
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indexer.chunk_compression_level,
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indexer.max_nb_chunks,
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max_memory,
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);
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let mut key_buffer = Vec::new();
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let mut value_buffer = Vec::new();
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2022-02-16 15:28:48 +01:00
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let mut cursor = docid_fid_facet_string.into_cursor()?;
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while let Some((key, original_value_bytes)) = cursor.move_on_next()? {
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2021-08-16 13:36:30 +02:00
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let (field_id_bytes, bytes) = try_split_array_at(key).unwrap();
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let field_id = FieldId::from_be_bytes(field_id_bytes);
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let (document_id_bytes, normalized_value_bytes) = try_split_array_at(bytes).unwrap();
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let document_id = u32::from_be_bytes(document_id_bytes);
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let original_value = str::from_utf8(original_value_bytes)?;
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key_buffer.clear();
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FacetStringLevelZeroCodec::serialize_into(
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field_id,
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str::from_utf8(normalized_value_bytes)?,
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&mut key_buffer,
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);
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value_buffer.clear();
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encode_prefix_string(original_value, &mut value_buffer)?;
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let bitmap = RoaringBitmap::from_iter(Some(document_id));
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bitmap.serialize_into(&mut value_buffer)?;
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facet_string_docids_sorter.insert(&key_buffer, &value_buffer)?;
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}
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sorter_into_reader(facet_string_docids_sorter, indexer)
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}
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